Grate for steam-boilers and the like.



No.. 820,785. PATENTBD MAY l5, 1906.l

BQP. HART, JR.

GRA'IE FOR STEAM BDILERS AND THE LIKE. APPLIOATION FILED AUG. s. 1905.

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BENJAMIN F. HART, JR., OF HOBOKEN, NEW JERSEY, ASSIGNOR TO B. FRANKLIN HART, JR., t OO., OF NEW YORK, N. Y., A OOPARI- NERSHIP.

Specification of Letters Patent.

ratented May 15, 1906.

Application filed August 9,1905. Serial No. 273,394..

To all whom, it may concern.-

Be it known that l, BENJAMIN F. HART,

Jr., a citizen of the United States, residing at Hoboken, in the county of Hudson and State of New Jersey, have invented certain new and useful Improvements in Grates for Steam-B Oilers and the Like, of which the following is a specification.

My invention relates to grate-bars and bearings therefor for furnaces of steam-boilers and the like.

The objects of my invention are, first, to provide a rocking grate-bar having its bearing-surfaces rounded, thereby insuring a uniform bearing-surface at every point of turning and insuring an absolutely central position with regard to the adjacent grate-bars when brought back to its normal position, thus preventing chances for fine grades of coal from dropping through the openings at one side of a bar; second, to so construct the grate-bar that its cross-section shows sloping flat surfaces with sharp corners at the junction of the outside vertical faces and the top faces, the slope offering an easy pitch for shedding purposes'` and the sharp edges at each side a means of crushing clinkers; third, to so construct and proportion the metal in the grate-bar as to do away with internal inclined ribs at certain portions which are an element of weakness due to unequal shrinkage strains in casting; fourth, other evident advantages of construction and relation of parts which will appear from the hereinafter detailed description.

My invention consists of structural fea tures and relative arrangements of the parts which will be hereinafter more clearly described and particularly pointed out in the appended claims. u n

Referring to the drawings, 1n winch s1m1- lar reference characters indicate the same parts in the several figures, Figure 1 is a plan view of a fire-grate embodying my invention.

Fig. 2 is a side view of the same. Fig. 3 is a view of the under side of one of the gratebars. Fig. i is an enlarged view of a section taken on line 4 4 of Fig. 2. Fig. 5 is a similar view of a section taken on line 5 5 of Fig. 3. Fig. 6 is an enlarged and fragmentary view of a section taken on line 6 6 of Fig. 5. Fig. 7 is afront elevation, on a slightly reduced scale, of the center bearing-bar, and Fig. 8 is a view imilar to Fig. 7 of the front and rear bearingars.

The grate, as shown in Fig. 1, is made up of a series of arallel Grate-bars 1 v1, supported at each en by bearing-bars 2 and 3 andv pref- 1e3rably at the middle by a central bearing- Each of the grate-bars 1 1 (see Figs. Ll and 5) is made U-shaped in cross-section and having its upper face formed by sides 5 5, sloping from the central portion and forming sharp corners 6 6 with* the outside vertica faces of the webs 7 7. The slope of the upper faces 5 5 thereby forms an easy pitch for shedding purposes and the sharp corners or edges 6 6 a means for crushing clinkers when the grate-bars are rocked on their bearingbars 2, 3, and 4, as hereinafter described.

Opening downward through the sloping upper faces 5 5 and main body of the gratebars are numerous openings 8 8, which are of a larger diameter at the bottom than at the top, the usual and common construction, and for the purpose of self-fclearance of ashes. The openings 8 8 are uniformly distributed throughout the upper face for the purpose of insuring a proper distribution of the air and efficient combustion of the fuel on the grate.

The grate-bars are reinforced and the webs or side lstrengthened by providing a fillet portion 9, (see Figs. 5 and 6,) which extends the full length of the grate-bar in each corner, formed by the under side of the main body of the grate-bar and the inner side of the webs 7 7. By this construction I have made a simple pattern which can be easily withdrawn from the mold and at the same time insure an `even distribution of the metal in cooling and a uniform cooling of the same after casting, and thus avoid internal strains and breaks in the finished grate-bar.

The under side of the grate-bar at the front, rear, and central portion :is provided with bearing portions 10 10, respectively, (see Fig. 3,) each of which, as clearly indicated in cross-section, Fig. 4, is provided with a central depression 11, having its highest portion rounded and the ridges 11 11. intermediate of the depression 11 and the web s IOO 7 7 so curved as to provide a rocking surface The bearing-bars 2, 3, and 4 are provided on their upper sides with a series of properlyspaced projections 12 12, each of which is formed in its top with a protuberance 13 and on each side of said protuberance with a depression or recess 13, properly curved and spaced, so as to register and form proper bearing-seats for the ridges 11 11l of the grate-bars, while the protuberance 13 is seated in the depression 11, which construction and arrangement enable the grate-bar to receive arocking movement and permit its easy return to a central position and retain the same in such and normal position, as indicated.

The upper and outer sides of the projections 12 12 are rounded or curved, so as to properly fit within the space between the two depending ridges 11 11 and the fillet portions 9 9 in the corners of the inner sides of seen by the webs 7 7.

From the foregoing construction, it will be means of the depression 11, ridges 11 11, and the fillet portions 9 9 on the un der side of the grate-bar used in conjunction with the protuberance 13 and depressions or recesses 13 13 in the projections 12 I have devised bearing-surfaces for the grate-bars which are easily and cheaply manufactured, by which each bar is easily rocked on its bearing-surfaces, and which insures a central and proper position to the adjacent grate-bars when returned to its normal positions after rocking. The sides of the projections 12 12 are undercut, as shown at 14 14, for the purpose of allowing the lower portion of the sides or webs of the grate-bars to swing in toward the supporting projection 12 without striking the same and giving ample movement to insure breaking up the clinkers.

The front and rear bearing-bars 2 and 3, as shown in Figs. 1 and 2, have their series of projections 12 12 extended laterally from their sides and engage the bearingesurfaces 10 10 on the ends of the grate-bars, while on the central bearing-bar 4 they project upwardly between the sides or webs and engage similar bearing-surfaces 10 at the middle portions of the grate-bars.

While I have shown a central bearing-bar 4, it will be readily seen that -in cases of small furnaces when the grate-bars are shortA this central bar may be dispensed with without departing from the invention.

The forward end ofeach of the grate-bars is provided with a crank-arm 15, which eX- tends below and forward, whereby with any suitable arrangement readily suggested to those skilled in the art any one of the several bars may be independently rocked and enable one to maintain a clear and bright fire with less labor by the stoker and wear on the apparatus than heretofore.

I/Vhile I have herein shown and described one and the preferred form of my invention, I do not wish to limit myself to the exact construction and relation of the parts as herein disclosed, and desire it to be distinctly understood that many changes would be readily suggested by one skilled in the art without departing from the spirit of my invention.

Having now fully described my invention, what I claim as new, and desire to secure by Letters Patent, is as follows:

1. A grate for steam-boilers or the like comprising a front and a rear bearing-bar, a series of separated projections on each of the bearing-b ars, each of the projections provided on its upper side with a protuberance and with a recess or depression on each side of said protuberance, a series of rate-bars each having on the under side of each of its ends a rounded depression and a ridge on each side thereof, which depression and ridges are adapted to register respectively witri said protuberance and recesses or depressions on said projections of the front and rear bearingbars and air-openings through the body of the grate-bar, and means for rocking said gratebar.

2. A grate for steam-boilers or the like comprising a front and a rear bearing-bar, a series of separated projections on each ofthe bearing-b ars each of the projections provided on its upper side with a protuberance and with a recess or depression on each side of said protuberance, a series of grate-bars of inverted-U shape in cross-section each having side webs and on the under side of each of its ends a rounded depression and a ridge on each side of the depression, which depression and ridges are adapted to register respectively with said protuberance and recesses or depressions on the projections of the front and rear bearing-bars and air-openings through the body of the grate-bar, and means for rocking said grate-bars.

3. A grate for steam-boilers or the like comprising a front and a rear bearing-bar, a series of separated and undercut projections on each of the bearing-bars, each of the projections provided on its upper side with a protuberance and with a recess or depression on each side of said protuberance, a series of grate-bars of inverted-U shape in cross-section each having side webs and provided with a strengthening fillet portion in each of the corners formed bythe side webs and the bottom of the main portion of the grate-bar and extending the full length of the same, and on the under side of each of the grate-bar ends a rounded depression and a ridge on each side of the depression which depression and ridges are adapted to register respectively with said protuberance and recesses or depressions on the projections of the front and rear bearingbars and air-openings through the body of the grate-bar, and means for rocking said grate-bar.

4. A grate for steam-boilers or the like comprising a front and a rear bearing-bar, a

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on each of the bearing-bars, each of the projections provided on its upper side Witha. protuberance and With a recess or depression on each sideof said protuherance, e series o grate-bars of inverted-U shape in cross-section each having side Webs and upper shedding-surfaces which incline from the center toward the sides of the gratefber and form obtuse angles With the outer Walls of the side Webs, a strengthening llet portion in each of the corners formed by the side Webs and the bottom of the main portion of the grate-har and extending the i'ull length of the seme7 and on the under side of each of the grate-bar ends a rounded depression and a ridge on each side of the depression, which depression and ridges are adapted to register respectively Wi th said protuberanoe and recesses or depressions on the projections of the front and rear bearing bars and air openings through the body of the grate-bar, and means for rocking said grate-bars.

In testimony whereof I a'HiX my signature in presence of tWo Witnesses.

BENJAMIN F. HART, JR.

Witnesses:

ARTHUR J. DUNKLE, ABRAHAM L. HART. 

